package javaEight;

import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.Predicate;

/**
 * @description:java内置的大核心函数式接口 消费型接口    Consumer<T>     void accept(T t)
 * 供给型接口    Supplier<T>     T get()
 * 函数型接口    Function<T,R>   R apply(T t)
 * 断定型接口    Predicate<t>    boolean test(T t)
 * @author:Mr.Cat
 * @create:2021-12-07 20:42
 **/
public class LambdaTest2 {
    @Test
    public void test1() {
        happyTime(500, new Consumer<Double>() {
            @Override
            public void accept(Double aDouble) {
                System.out.println("学习太累了，去天上人间买了瓶矿泉水价格为：+" + aDouble);
            }
        });
        System.out.println("------------");
        happyTime(400, money -> System.out.println("我们爱的没有错" + money));
    }

    public void happyTime(double money, Consumer<Double> con) {
        con.accept(money);
    }

    @Test
    public void test2() {
        List<String> list = Arrays.asList("北京", "南京", "天津", "东京", "东京", "西京", "普京");
        List<String> filterStrs = filterString(list, new Predicate<String>() {
            @Override
            public boolean test(String s) {
                return s.contains("京");
            }
        });
        System.out.println(filterStrs);

        List<String> filterStrs1 = filterString(list, s -> s.contains("京"));
    }

    //根据给定的规则，过滤集合中的字符串。此规则由Predicate的方法决定
    public List<String> filterString(List<String> list, Predicate<String> pre) {
        ArrayList<String> filterList = new ArrayList<>();
        for (String s : list) {
            if (pre.test(s)) {
                filterList.add(s);
            }
        }
        return filterList;
    }
}

